We learn from this ayah that theft is a major sin. Any crime for which there’s a Hadd or Prescribed Punishment it’s a major sin. How lowly could someone be for the sake of some money, a bag, a mobile phone, someone is getting his hand cut off? When a person steals a small thing and is not caught or punishment, he goes on to steal something more valuable. Therefore, quarter of a dinar was set as a nisaab. If a crime is not stopped right there, the corruption will spread. From stealing things, he will one day start murdering other people.